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The sustained elevation during Days 12--21 of pregnancy of rat luteal ornithine decarboxylase, which is inducible experimentally by hCG and PGF-2 alpha, was dependent upon intact placentae and oestrogen, but independent of prostaglandin, and was absent at corresponding times of pseudopregnancy. It is suggested that his enzyme activity is a response to an hCG-like hormone of placental origin. Two brief reappearances of enzyme activity on Days 21 and 22 of pregnancy, dependent upon intact placentae and upon both oestrogen and prostaglandin, suggest a pulsatile release of PGF-2 alpha from the uterus or placentae. These experiments illustrate the value of ornithine decarboxylase in seeking unknown hormonal influences upon the corpus luteum.

Ornithine decarboxylase as a monitor for luteal stimuli in the pregnant rat